Structural Analysis of Aluminum Oxyhydroxide Aerogel by Small Angle X-Ray Scattering

Khodan, A.N.; Kopitsa, G.P.; Yorov, K.E.; Baranchikov, A.E.; Ivanov, V.K.; Feoktystov, A.; Pipich, V.

Авторы: Khodan A.N., Kopitsa G.P., Yorov Kh E., Baranchikov A.E., Ivanov V.K., Feoktystov A., Pipich V.
Журнал: Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques
Том: 12
Номер: 2
Год издания: 2018
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 287
Последняя страница: 296
Оригинальные версии: Анализ структуры аэрогелей оксигидроксида алюминия методами малоуглового рассеяния , Анализ структуры аэрогелей оксигидроксида алюминия методами малоуглового рассеяния
DOI: 10.1134/S102745101802026X
Аннотация: The work presents studies on the microstructure and mesostructure of nanostructured aluminum oxyhydroxide formed as a high porous monolithic material through the surface oxidation of aluminum liquidmetal solution in mercury in a temperature- and humidity-controlled air atmosphere. The methods of X-ray diffraction analysis, thermal analysis, the low temperature adsorption of nitrogen vapors, transmission electron microscopy, small-angle and very small-angle neutron scattering, and small-angle X-ray scattering are used for comprehensive investigation of the samples synthesized at 25°С as well as that annealed at temperatures up to 1150°C. It is found that the structure of the monolithic samples can be described within the framework of a three-level model involving primary heterogeneities (typical length scale of rc ≈ 9–19 Å), forming fibrils (cross-sectional radius R ≈ 36–43 Å and length L ≈ 3200–3300 Å) or lamellae (thickness T ≈ 110 Å and width W ≈ 3050 Å) which, in turn, are integrated into large-scale aggregates (typical size Rc ≈ 1.25–1.4 μm) with an insignificant surface roughness. It is shown that a high specific surface (~200 m2/g) typical for the initial sample is maintained upon its thermal annealing up to 900°С, and it decreases to 100 m2/g after heat treatment at 1150°С due to fibrillary agglomeration.
Добавил в систему: Ходан Анатолий Николаевич

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Structural Analysis of Aluminum Oxyhydroxide Aerogel by Small Angle X-Ray Scatteringстатья

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